针对管涌破坏模式,建立了双层地基堤防概化模型,选取了堤内外水位差、警戒水位持续天数、弱透水覆盖层厚度及强弱透水层渗透系数比值4个主要评估指标,开展了大量敏感性分析,确定了各评估指标对管涌发生影响的客观权重。研究表明:堤内外水位差和弱透水覆盖层厚度(<2 m)2个评估指标对管涌发生的影响权重相对比较大;同时,对于警戒水位持续天数、弱透水覆盖层厚度及强弱透水层渗透系数比值3个评估指标,需要分区间确定客观权重,不同区间,各指标的客观权重不同。研究成果为后续建立堤防安全评估方法提供了依据。
Abstract
In this paper a generalized double-layer foundation levee model is built to conduct sensitivity analysis on four major assessment indicators. These indicators include the water head difference between both sides of levee, the duration of warning water level, the thickness of less permeable layer, and the ratio of permeability of strongly permeable layer to that of less permeable layer. The objective weights of these four indicators influencing backward erosion piping are determined. Results indicate that the water head difference and the thickness of less permeable layer (less than 2 m) are two important indicators with relatively large weights. Meanwhile, the objective weights of three indicators, namely, the duration of warning water level, the thickness of less permeable layer, and the ratio of permeability coefficient, vary in different ranges.
关键词
堤防管涌 /
弱透水覆盖层 /
强透水覆盖层 /
渗透系数比值 /
权重敏感性 /
双层地基堤防 /
概化模型
Key words
piping danger of levee /
weakly permeable strata /
strongly permeable layer /
ratio of permeability coefficient /
sensitivity of weight /
dyke with dual foundation layers /
generalized model
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参考文献
[1] 罗玉龙,速宝玉,盛金昌,等.对管涌机理的新认识[J].岩土工程学报,2011,33(12):1895-1902.
[2] 朱方霞,陈华友.确定区间数决策矩阵属性权重的方法-熵值法[J].安徽大学学报(自然科学版),2006(5):4-6.
[3] 何晓洁,赵二峰.基于AHP-熵权法的黄河下游堤防安全模糊评价[J].三峡大学学报(自然科学版),2015, 37(1):38-42.
[4] SU H, QIN P, QIN Z. A Method for Evaluating Sea Dike Safety[J]. Water Resources Management, 2013, 27(15): 5157-5170.
[5] 汪明武,金菊良.投影寻踪方法在边坡稳定性评价中的应用[J].岩土工程学报,2002(5):619-621.
[6] 张家发, 王满星, 丁金华. 典型条件下堤身堤基渗流规律分析[J]. 长江科学院院报, 2000, 17(5): 23-27.
[7] 易朝路, 郭志高. 荆江大堤典型地段管涌险情与水情要素定量分析[J]. 水利学报, 2002, 33(8):113-117.
[8] 刘 杰, 谢定松, 崔亦昊. 江河大堤双层地基渗透破坏机理模型试验研究[J]. 水利学报, 2008, 39(11):1211-1220.
[9] 丁留谦, 张启义, 姚秋玲. 1998年长江流域管涌险情特点分析[J]. 水利水电技术, 2007, 38(2):44-45.
[10]刘 杰, 谢定松, 崔亦昊. 江河大堤堤基砂砾石层管涌破坏危害性试验研究[J]. 岩土工程学报, 2009, 31(8):1188-1191.
[11]李广诚. 中国堤防工程地质[M]. 北京:中国水利水电出版社, 2005.
[12]中华人民共和国住房和城乡建设部.GB 50286—2013,堤防工程设计规范[S].北京:中国计划出版社,2013.
[13]李广诚, 司富安, 杜忠信. 堤防工程地质勘察与评价[M]. 北京:中国水利水电出版社, 2004.
基金
国家重点研发计划项目(2017YFC1502603)
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